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/* $Id: s_texstore.c,v 1.1 2003-02-28 11:49:43 pj Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Authors:
* Brian Paul
*/
/*
* The functions in this file are mostly related to software texture fallbacks.
* This includes texture image transfer/packing and texel fetching.
* Hardware drivers will likely override most of this.
*/
#include "colormac.h"
#include "context.h"
#include "convolve.h"
#include "image.h"
#include "imports.h"
#include "macros.h"
#include "texformat.h"
#include "teximage.h"
#include "texstore.h"
#include "s_context.h"
#include "s_depth.h"
#include "s_span.h"
/*
* Read an RGBA image from the frame buffer.
* This is used by glCopyTex[Sub]Image[12]D().
* Input: ctx - the context
* x, y - lower left corner
* width, height - size of region to read
* Return: pointer to block of GL_RGBA, GLchan data.
*/
static GLchan *
read_color_image( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLint stride, i;
GLchan *image, *dst;
image = (GLchan *) MALLOC(width * height * 4 * sizeof(GLchan));
if (!image)
return NULL;
/* Select buffer to read from */
_swrast_use_read_buffer(ctx);
RENDER_START(swrast,ctx);
dst = image;
stride = width * 4;
for (i = 0; i < height; i++) {
_mesa_read_rgba_span( ctx, ctx->ReadBuffer, width, x, y + i,
(GLchan (*)[4]) dst );
dst += stride;
}
RENDER_FINISH(swrast,ctx);
/* Read from draw buffer (the default) */
_swrast_use_draw_buffer(ctx);
return image;
}
/*
* As above, but read data from depth buffer.
*/
static GLfloat *
read_depth_image( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLfloat *image, *dst;
GLint i;
image = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
if (!image)
return NULL;
RENDER_START(swrast,ctx);
dst = image;
for (i = 0; i < height; i++) {
_mesa_read_depth_span_float(ctx, width, x, y + i, dst);
dst += width;
}
RENDER_FINISH(swrast,ctx);
return image;
}
static GLboolean
is_depth_format(GLenum format)
{
switch (format) {
case GL_DEPTH_COMPONENT:
case GL_DEPTH_COMPONENT16_SGIX:
case GL_DEPTH_COMPONENT24_SGIX:
case GL_DEPTH_COMPONENT32_SGIX:
return GL_TRUE;
default:
return GL_FALSE;
}
}
/*
* Fallback for Driver.CopyTexImage1D().
*/
void
_swrast_copy_teximage1d( GLcontext *ctx, GLenum target, GLint level,
GLenum internalFormat,
GLint x, GLint y, GLsizei width, GLint border )
{
struct gl_texture_unit *texUnit;
struct gl_texture_object *texObj;
struct gl_texture_image *texImage;
texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
texObj = _mesa_select_tex_object(ctx, texUnit, target);
ASSERT(texObj);
texImage = _mesa_select_tex_image(ctx, texUnit, target, level);
ASSERT(texImage);
ASSERT(ctx->Driver.TexImage1D);
if (is_depth_format(internalFormat)) {
/* read depth image from framebuffer */
GLfloat *image = read_depth_image(ctx, x, y, width, 1);
if (!image) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyTexImage1D");
return;
}
/* call glTexImage1D to redefine the texture */
(*ctx->Driver.TexImage1D)(ctx, target, level, internalFormat,
width, border,
GL_DEPTH_COMPONENT, GL_FLOAT, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
else {
/* read RGBA image from framebuffer */
GLchan *image = read_color_image(ctx, x, y, width, 1);
if (!image) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyTexImage1D");
return;
}
/* call glTexImage1D to redefine the texture */
(*ctx->Driver.TexImage1D)(ctx, target, level, internalFormat,
width, border,
GL_RGBA, CHAN_TYPE, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
/* GL_SGIS_generate_mipmap */
if (level == texObj->BaseLevel && texObj->GenerateMipmap) {
_mesa_generate_mipmap(ctx, target, texUnit, texObj);
}
}
/*
* Fallback for Driver.CopyTexImage2D().
*/
void
_swrast_copy_teximage2d( GLcontext *ctx, GLenum target, GLint level,
GLenum internalFormat,
GLint x, GLint y, GLsizei width, GLsizei height,
GLint border )
{
struct gl_texture_unit *texUnit;
struct gl_texture_object *texObj;
struct gl_texture_image *texImage;
texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
texObj = _mesa_select_tex_object(ctx, texUnit, target);
ASSERT(texObj);
texImage = _mesa_select_tex_image(ctx, texUnit, target, level);
ASSERT(texImage);
ASSERT(ctx->Driver.TexImage2D);
if (is_depth_format(internalFormat)) {
/* read depth image from framebuffer */
GLfloat *image = read_depth_image(ctx, x, y, width, height);
if (!image) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyTexImage2D");
return;
}
/* call glTexImage2D to redefine the texture */
(*ctx->Driver.TexImage2D)(ctx, target, level, internalFormat,
width, height, border,
GL_DEPTH_COMPONENT, GL_FLOAT, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
else {
/* read RGBA image from framebuffer */
GLchan *image = read_color_image(ctx, x, y, width, height);
if (!image) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyTexImage2D");
return;
}
/* call glTexImage2D to redefine the texture */
(*ctx->Driver.TexImage2D)(ctx, target, level, internalFormat,
width, height, border,
GL_RGBA, CHAN_TYPE, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
/* GL_SGIS_generate_mipmap */
if (level == texObj->BaseLevel && texObj->GenerateMipmap) {
_mesa_generate_mipmap(ctx, target, texUnit, texObj);
}
}
/*
* Fallback for Driver.CopyTexSubImage1D().
*/
void
_swrast_copy_texsubimage1d( GLcontext *ctx, GLenum target, GLint level,
GLint xoffset, GLint x, GLint y, GLsizei width )
{
struct gl_texture_unit *texUnit;
struct gl_texture_object *texObj;
struct gl_texture_image *texImage;
texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
texObj = _mesa_select_tex_object(ctx, texUnit, target);
ASSERT(texObj);
texImage = _mesa_select_tex_image(ctx, texUnit, target, level);
ASSERT(texImage);
ASSERT(ctx->Driver.TexImage1D);
if (texImage->Format == GL_DEPTH_COMPONENT) {
/* read depth image from framebuffer */
GLfloat *image = read_depth_image(ctx, x, y, width, 1);
if (!image) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyTexSubImage1D");
return;
}
/* call glTexSubImage1D to redefine the texture */
(*ctx->Driver.TexSubImage1D)(ctx, target, level, xoffset, width,
GL_DEPTH_COMPONENT, GL_FLOAT, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
else {
/* read RGBA image from framebuffer */
GLchan *image = read_color_image(ctx, x, y, width, 1);
if (!image) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyTexSubImage1D" );
return;
}
/* now call glTexSubImage1D to do the real work */
(*ctx->Driver.TexSubImage1D)(ctx, target, level, xoffset, width,
GL_RGBA, CHAN_TYPE, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
/* GL_SGIS_generate_mipmap */
if (level == texObj->BaseLevel && texObj->GenerateMipmap) {
_mesa_generate_mipmap(ctx, target, texUnit, texObj);
}
}
/*
* Fallback for Driver.CopyTexSubImage2D().
*/
void
_swrast_copy_texsubimage2d( GLcontext *ctx,
GLenum target, GLint level,
GLint xoffset, GLint yoffset,
GLint x, GLint y, GLsizei width, GLsizei height )
{
struct gl_texture_unit *texUnit;
struct gl_texture_object *texObj;
struct gl_texture_image *texImage;
texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
texObj = _mesa_select_tex_object(ctx, texUnit, target);
ASSERT(texObj);
texImage = _mesa_select_tex_image(ctx, texUnit, target, level);
ASSERT(texImage);
ASSERT(ctx->Driver.TexImage2D);
if (texImage->Format == GL_DEPTH_COMPONENT) {
/* read depth image from framebuffer */
GLfloat *image = read_depth_image(ctx, x, y, width, height);
if (!image) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyTexSubImage2D");
return;
}
/* call glTexImage1D to redefine the texture */
(*ctx->Driver.TexSubImage2D)(ctx, target, level,
xoffset, yoffset, width, height,
GL_DEPTH_COMPONENT, GL_FLOAT, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
else {
/* read RGBA image from framebuffer */
GLchan *image = read_color_image(ctx, x, y, width, height);
if (!image) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyTexSubImage2D" );
return;
}
/* now call glTexSubImage2D to do the real work */
(*ctx->Driver.TexSubImage2D)(ctx, target, level,
xoffset, yoffset, width, height,
GL_RGBA, CHAN_TYPE, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
/* GL_SGIS_generate_mipmap */
if (level == texObj->BaseLevel && texObj->GenerateMipmap) {
_mesa_generate_mipmap(ctx, target, texUnit, texObj);
}
}
/*
* Fallback for Driver.CopyTexSubImage3D().
*/
void
_swrast_copy_texsubimage3d( GLcontext *ctx,
GLenum target, GLint level,
GLint xoffset, GLint yoffset, GLint zoffset,
GLint x, GLint y, GLsizei width, GLsizei height )
{
struct gl_texture_unit *texUnit;
struct gl_texture_object *texObj;
struct gl_texture_image *texImage;
texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
texObj = _mesa_select_tex_object(ctx, texUnit, target);
ASSERT(texObj);
texImage = _mesa_select_tex_image(ctx, texUnit, target, level);
ASSERT(texImage);
ASSERT(ctx->Driver.TexImage3D);
if (texImage->Format == GL_DEPTH_COMPONENT) {
/* read depth image from framebuffer */
GLfloat *image = read_depth_image(ctx, x, y, width, height);
if (!image) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyTexSubImage3D");
return;
}
/* call glTexImage1D to redefine the texture */
(*ctx->Driver.TexSubImage3D)(ctx, target, level,
xoffset, yoffset, zoffset, width, height, 1,
GL_DEPTH_COMPONENT, GL_FLOAT, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
else {
/* read RGBA image from framebuffer */
GLchan *image = read_color_image(ctx, x, y, width, height);
if (!image) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyTexSubImage3D" );
return;
}
/* now call glTexSubImage3D to do the real work */
(*ctx->Driver.TexSubImage3D)(ctx, target, level,
xoffset, yoffset, zoffset, width, height, 1,
GL_RGBA, CHAN_TYPE, image,
&_mesa_native_packing, texObj, texImage);
FREE(image);
}
/* GL_SGIS_generate_mipmap */
if (level == texObj->BaseLevel && texObj->GenerateMipmap) {
_mesa_generate_mipmap(ctx, target, texUnit, texObj);
}
}